Vat dyestuff of the anthraquinone-acridone series



United States Patent "ice patented fffflil 1 2 2,729,631 The detailed preparation of this novel dyestufi will VAT DYESTUFF OF THE ANTHRAQUINONE- be apparent to those skilled in the art from a considera- ACRIDONE SERIES tion of the following specific example: Paul Nawiasky, Summit, N. 3., and L. D. liarrick, Pitts- E burgh, Pa., assignors to General Aniline & Film Cor- 5 xample poration, New York, N. it a corporation of Delaware 68 parts (02 mole) of 4 amino anthraquinone 21 N0 Drawmgfkppllcatlon May benzacridone were charged into a solution of 42.2 parts Serial 289,207 (0.1 mole) of azo-diphenyl 4,4-dicarbonyl chloride and 1 Clalm- (CL 260-455) 30 parts of pyridine in 1000 parts of dichlorobenzene at The present invention relates to a novel dyestufi of 110-1 C. The reaction mixture was stirred at the anthraquinone-acridone series. 110-115" C. until condensation was complete, as shown We have found that the novel vat dyestufi obtained by the absence of green coloration of a test sample in by condensing two moles of 4-amin0anth1aquin0ne-2-1- boric acid-acetic anhydride solution. The mixture was benzacridone with one mole of aZodiphenyl-p,p'-dicarthen allowed to cool to C. and the insoluble conboxylic acid chloride has many desirable properties. The 15 densation products washed with alcohol and dried. The thus obtained vat dyestuff, when dyed or printed on vegeproduct, Which has the r u (L O 0 =0 0: l

table fibers by the usual vat dyeing or printing techniques, was a green powder which was acid pasted from cold gives a desirable, rather unique shade of yellowish-green. concentrated sulfuric acid and made into a water paste The thus obtained dyeings are characterized by very good suitable for printing and dyeing. It dyed and printed fastness to chlorine and other properties. 40 cotton a yellowish-green shade.

The novel dyestufi of the present invention and its The present application is a continuation-in-part of our method of preparation is illustrated graphically in the copending application Serial No. 617,673, filed Septemfollowing equation: ber 20, 1945 (now abandoned).

3 We" claim: The vat dyestuff of the formuia:

References Cited in the file of this patent UNITED STATES PATENTS 2,156,731 Lange et al. May 2, 1939 2,228,455 Honold et a1 I an. 14, 1941 2,235,480 Graenacher et a1 Mar. 18, 1941 2,568,966 Morgeli et a1 Sept. 25, 1951 

